1 files changed, 0 insertions, 8 deletions
diff --git a/compiler/rustc_builtin_macros/src/errors.rs b/compiler/rustc_builtin_macros/src/errors.rs
index b28f7d312d9..b3cc460abbf 100644
--- a/compiler/rustc_builtin_macros/src/errors.rs
+++ b/compiler/rustc_builtin_macros/src/errors.rs
@@ -188,14 +188,6 @@ mod autodiff {
     }
 
     #[derive(Diagnostic)]
-    #[diag(builtin_macros_autodiff_mode)]
-    pub(crate) struct AutoDiffInvalidMode {
-        #[primary_span]
-        pub(crate) span: Span,
-        pub(crate) mode: String,
-    }
-
-    #[derive(Diagnostic)]
     #[diag(builtin_macros_autodiff_width)]
     pub(crate) struct AutoDiffInvalidWidth {
         #[primary_span]